Tuesday, 2 February 2010

Overexposure and underexposure

A photograph may be described as overexposed when it has a loss of highlight detail, that is, when the bright parts of an image are effectively all white, known as blown out highlights (or clipped whites). A photograph may be described as underexposed when it has a loss of shadow detail, that is, the dark areas indistinguishable from black, known as blocked up shadows (or sometimes crushed shadows, crushed blacks, or clipped blacks, especially in video). As the image to the right shows, these terms are technical ones rather than artistic judgments; an overexposed or underexposed image may be "correct", in that it provides the effect that the photographer intended.
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